Cutting-off blade



Patented July 22, i947 Y"John'lVL Luers,v'lvl'lount Clemens, Mich., assigner to John Milton Luers Patents Incorporated,

Mount Clemens, Michigan Mich.,

a corporation of Application November 8, 1945, Serial No. 621,418

3 Claims.

This invention relates to improvements in cutting-off blades. Due to the fact that as cutting proceeds with such a blade its depth of penetration between the two opposed faces of the work being severed increases there is frequently no room for lateral chip expansion and consequently there is a great tendency for the chips or cuttings to pack in the cut formed by the blade.l

It is an object of this invention to provide a cutting-ofi blade including a preformed cutting surface which is serrated, that is provided with longitudinal corrugations, either curved or pointed, so that each corrugation forms a short inclined cutting surface which extends both above and below the axis of the work. Each inclined face of each corrugation forms a separate cutting lip so that the chips are transversely broken up thereby providing lateral chip expansion.

A further object of the invention is to provide such a cuttingeoif blade wherein the serrations or corrugations, though only shallow, by their multiplicity add su'ciently to the chip length to insure complete chip freedom in a transverse direction without extending the vertical distance from the work axis to the tops and bottoms of the corrugations suiiiciently to retard the cutting action of the blade.

Another object of the invention is to provide a cutting-off blade wherein the end corrugations or serrations are upwardly and outwardly inclined to provide positive shear or rake, and the outer extremities of the end corrugations terminate below the tops of the intermediate ones and substantially on the axis of the work.

Having thus stated some of the objects and advantages of the invention I will now describe it in detail with the aid of the drawing, in which:

Figure l shows a front view of the invention wherein the serrations or corrugations extending transversely of the cutting surface are pointed at their extremities.

Figure 2 is a side View thereof.

Figure 3 is a perspective view of the blade.

Figure 4 is a slightly modified front view wherein the ends of the serrations or corrugations are curved instead of pointed, and

Figure 5 is a perspective view thereof.

Referring to the drawing, l designates a blade having a preformed cutting surface 2 extending longitudinally along one edge face, the opposite sides 3 of the blade are inwardly and downwardly inclined from the cutting surface to provide side clearance, and one end 4 is also downwardly and inwardly inclined from one extremity of the cutting surface 2 to provide clearance beneath a cutting edge 5 formed transversely of the cutting surface at its junction with the said blade end.

The cutting surface .2 consists of a plurality of serrations or corrugations =B extending longitudinally of the blade throughout its ventire width and a substantially equal distance both above and beneath the axis B of the work A to be severed by the blade. The upper or lower extremities of the serrations or corrugations 6 may either be pointed as shown in Figures l and 3 or curved as shown in Figures 4 and 5. In either event the outer serration or corrugation on each side of the cutting surface is upwardly and outwardly inclined to provide positive shear or rake, and the upper extremity of each outer corrugation or serration terminates beneath the tops of the intermediate serrations so that it lies substantially on the axis B of the work A.

It will thus be seen that each inclined face of each serration or corrugation 6 takes a separate cut so that ample lateral chip clearance is provided due to the multiplicity of the serrations or corrugations and at the same time their upper and lower extremities do not extend sufliciently above or beneath the axis of the work to impair the cutting action of the blade.

While in the foregoing the preferred embodiments of the invention have been described and shown, it is understood that alterations and modifications may be made thereto provided the said alterations and modifications fall within th scope of the appended claims.

What I claim is:

l. A cutting-oil blade including a body having a preformed cutting surface extending along one edge face, said surface having a plurality of corrugations of uniform depth extending longitudinally thereof, the upper and the lower extremities of the corrugations each being in transverse alignment, the outer corrugations at each side being upwardly and outwardly inclined, and the end of the body being downwardly and inwardly inclined from one end of the cutting surface to form a cutting edge across its junction with that end of the cutting surface.

2. In a cutting-off blade the combination set forth in claim 1, wherein the upwardly and outwardly inclined end corrugations terminate at their outer extremities beneath the tops of the intermediate corrugations.

3. A cutting-off blade including a, body having a preformed cutting surface extending along one edge face, said surface having a plurality of cor-` rugations of uniform depth extending longitudinally thereof, the upper and lower ends of the oorrugations being pointed and tne said upper REFERENCES CITED extremities and the lower extremlties each being in transverse alignment, the outer Corrugation The foliowlng references are of record 1n the at each of the cutting surface being upwardly file 0f thlS patenti and outwardly inclined and terminating below l UNITED STATES PATENTS the tops of the intermediate corrugations, and one extremity of the body :being downwardlyanq Wambel? 1 ,-Namfle1 l Date 9 inwardly inclined frorn'one end *of the 'cu'tn -zlzlf' Lurs Oct 17 l.) surface to form a cutting edge across its junc- 2,370,273 Uulman Feb' 27 1 tion with that end of the cutting surface. 10" A. FOREIGN PATENTS JOHN M vl"llfx'mber Country Date 23,699 y Great Britain Oct, 14, 1897 

